deprecate unneeded utils.Testing #15360

Job	Run time
appimage-ignore-tests	0s
static-ignore-tests	0s
macos / build	15m 0s
license_finder / Audit 3rd-Party Licenses	1m 13s
test / Test meta.json jsonschema	23s
test / Go Coverage Tests	0s
test / linux-amd64 Go Unit Tests	13m 39s
test / Test Raspberry Pi Code	39s
test / linux-arm64 Go Unit Tests	14m 25s
test / Test End-to-End and Web	4m 37s
test / Go 32-bit Unit Tests	10m 13s
test / Test Longer-running Motion Plans if affected / Check files	9s
test / Test Longer-running Motion Plans if affected / Motion Extended Tests	0s
test / All Tests Passing	1s
appimage	0s
static	0s
droid / droid-build	0s
	1h 0m 19s

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